Vacuum-fuel-feed device for internal-combustion engines.



.I. L. BREESE, 1R.

VACUUM FUEL FEED DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JUNE I4. 1938.

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VACUUM-FUEL-FEED DEVICE FOR INTERNAL-COMBUSTION ENGINES v Specification of Letters Patent.

Patented Feb. r11, 11ers.

Application filed June 14, 1918. Serial No.240 ,066.

ments in Vacuum-Fuel-Feed Devicesfor In- 1 ternal-Combustion Engines, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. 1

. The purpose of this invention is to provide an improved device of the nature of a flow of-or to permit vacuum fuel feed device for internal combustion engines. The specific purpose of the invention is to provide a more reliable speed to the engine under circumstances of unavoidable change of level of the device with respect to the carbureter, as in aeroplane service. It consists in the elements and features of construction shown and described, as indicated in the claim. In the drawing:

he figure is a vertical axial section of a vacuum fuel feed device equipped with the features constituting this invention.

The usual features of a vacuum fuel feed device are shown in the drawing, 1 being the reserve fuel chamber, 2 the vacuum chamber suspended within the reserve chamher, 3 the suction connection for producing partial vacuum in the vacuum chamber. 4:,

which is usuallya mere atmospheric connection is in this construction a connection leading to a source of super-atmospheric pressure, represented conventionally by what 1lgiay be regarded as a compressed air chain,-

er, 4. suction connection to the vacuum chamber, 6 the valve controlling the pressure connection to the the vacuum chamber which, by means of a lever system, 8, operates the valves, 5 and 6, according to the level of liquid in the vacuum chamber. .9 isa pipe line leading om alow level tank, not shown, for sup-' plying liquid fuel to the vacuum chamber, 2. 10 is a check valve which controlsthe communication of the pipeline, 9, with the vacuum chamber, said check valve being adapted to be seated b pressure within the vacuum chamber, an opened readily by into the vacuum chamber when the conditions tend to cause such flow. 11 is a check valve which controls the outlet from the. vacuum chamber into the reserve chamb a partialcertain new and useful Improve the reserve chamber,

of the carburetor,

' exception that instead of sure being'admitted to the vacuum chamber 5 is the valve controlling the of atmospheric.

. atmospheric pressure necessitates the valve,

vacuum chamber, 7 the fioatin flow of-the liquid 1, being adapted to be seated by suction or vacuum operating in the chamber, 2, and to be opened with and by the flow of the liquid from the vacuum chamber into the reserve chamber as usual. 13 is the.'connection from the reserve chamber, 1, for supplying the carbureter. It is contem-' plated that, when it is desired, superatmospheric pressure may be maintained in the compressed air chamber, 4., by any sultable means for that purpose, not shown.

Usually a pressure of from one to two pounds will serve the purpose of the device, which is to afford pressure at all times upon 1, for supplying the carburetor from said chamber, so that the supply may be maintained either even thoughit may be found desirable to' locate the entire. device spmewhat below'the level '7 or, in case the conditions of use cause the vacuum feed device to be temporarily at a lower level than thecarbureter, as is frequently the case in aeroplane service. Such pressure, it will be seen, would under such circumstances be necessary in orderthat the carbureter might be supplied in the absence of conditions which would causeit to be supplied by gravity.

It will be seen that the operation of the device is the usual operation of a vacuum fuel feed device of this character with the atmospheric presupon the opening of the valve 6, by the rise of the float, there will be admitted to said chamber pressure somewhat in excess he presence of this superl0,w hich would otherwise. be unnecessary,for controlling the communication of the vacuum chamber with the liquid fuel supply line, 9. It will be seen that upon the reversal of the valve situation,-that is, the opening of the suction valve, 5, and the seating of thepressure-controlling valve, 6, the action will be precisely the same as in the usual construction of this class of devices, except that the super-atmospheric pressure existing in the chamber, 2, will cause a little more air to be taken from said chamber by the suction; but this will occur so promptly as not to substantially afl'ect the operation'of the device. Also the existence immersion of the float, 7, that is, a little 'These slight variatlons in the action of higher rise of the liquid in the vacuum chamber, 2, for unseating said valve, 6, and

. seating the suction valve when the vacuum chamber is filled; that is, the vacuum chamher will fill to a somewhat higher level than would be the case if there ,were only at- .mospheric pressure instead of super-atmosv insuring of supply from the reserve chamber 1 to the carbureter, constitute the substantial advantages sought.

I claim 2-- In avacuum fuel feed device, in combination with a vacuum chamber and suction connection thereto, a reserve chamber into which the vacuum chamber discharges; a fuel supply line leading to the vacuum chamber; means adapted to obstructback flow from said vacuum chamber "through said supply line; air passages from the tops of the chambers, respectively, a source of super-atmospheric pressure With which both said passages communicate; and means for alternating the dominance in the vacuum chamber of the suction and super-atmospheric pressure.

hereof, I have hereunto set In testimony W my hand at Washington, D. C.,this' 31st day of May, 1918.

JAMES L. BEE-ESE, JR. 

